嵌入式arduino计数小程序

/*内容：以按键单击（表示为0），⻓长击（表示为1） 为输⼊入，统计连续1(包括单个1)出现的状态总共的次 数。 
要求 必须包含fsm，中断，不不可以使⽤用轮询！！！ 每一次按键，led亮一次 需要进⾏行行消抖*/

int last_state=0;     
int current_state=0;    
int count=0;         
int ledPin=13;        
int buttonPin=2;    
unsigned long duration;   

void setup() {
  // put your setup code here, to run once:
  Serial.begin(9600);
  pinMode( ledPin , OUTPUT);      
  pinMode( buttonPin , INPUT);     
  attachInterrupt(0, counter, CHANGE);   
}

void loop() {
  // put your main code here, to run repeatedly:
  switch(current_state){
    case 1:     
      if(last_state==0){
        count++;
        Serial.print("count:");
        Serial.println(count); 
      }
      last_state=current_state;
      break;
    case 0:
      //digitalWrite( ledPin , LOW );
      last_state=current_state;
      break;
  }
}

void counter(){
  if (!( digitalRead( buttonPin) )){
    delay( 50 );  
    if (!( digitalRead( buttonPin) )){      
      digitalWrite( ledPin , HIGH );
      duration=pulseIn(buttonPin,LOW,60000000);     
      if(duration/1000000.0>1){
        current_state=1;
        //Serial.begin(9600);
        Serial.print("time:");
        Serial.println("long"); 
      }else{
        current_state=0;
        //Serial.begin(9600);
        Serial.print("time:");
        Serial.println("short");
      }
      digitalWrite( ledPin , LOW );
    }  
  }




}